EFFECT OF PRESSURE ON INTERLAYER COUPLING AND SUPERCONDUCTING TRANSITION TEMPERATURE OF Bi-2201 AND Bi-2212

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3744-3746 ◽  
Author(s):  
AUGUST YURGENS ◽  
DAG WINKLER ◽  
TORD CLAESON ◽  
TAKASHI MURAYAMA ◽  
YOICHI ANDO
Keyword(s):  
Transition Temperature ◽  
Critical Temperature ◽  
Hydrostatic Pressure ◽  
Single Crystals ◽  
Critical Current ◽  
Superconducting Transition Temperature ◽  
Interlayer Coupling ◽  
Superconducting Transition ◽  
Effect Of Pressure

We used the hydrostatic pressure P<1 GPa as a tool to change the c-axis interlayer coupling of Bi 2 Sr 1.5 La 0.5 CuO 6+δ (Bi-2201) and Bi 2 Sr 2 CaCu 2 O 8+δ (Bi-2212) single crystals. The c-axis critical current, as a measure of the interlayer coupling, drastically increases with pressure (up to 270% GPa -1). The superconducting critical temperature, on the contrary, only slightly increases with a rate of ≈ 2 - 6% GPa -1, This implies that the CuO-interlayer coupling has little effect on Tc in Bi-2201.

scholarly journals Research Progress on Ni-Based Antiperovskite Compounds

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
P. Tong ◽  
Y. P. Sun
Keyword(s):  
Phase Diagram ◽  
Transition Temperature ◽  
Single Crystals ◽  
Superconducting Transition Temperature ◽  
Spin Fluctuations ◽  
Research Progress ◽  
Future Research ◽  
Magnetic Element ◽  
Superconducting Transition ◽  
Cubic Structure

The superconductivity in antiperovskite compound MgCNi3was discovered in 2001 following the discovery of the superconducting MgB2. In spite of its lower superconducting transition temperature (8 K) than MgB2(39 K), MgCNi3has attracted considerable attention due to its high content of magnetic element Ni and the cubic structure analogous to the perovskite cuprates. After years of extensive investigations both theoretically and experimentally, however, it is still not clear whether the mechanism for superconductivity is conventional or not. The central issue is if and how the ferromagnetic spin fluctuations contribute to the cooper paring. Recently, the experimental results on the single crystals firstly reported in 2007 trend to indicate a conventionals-wave mechanism. Meanwhile many compounds neighboring to MgCNi3were synthesized and the physical properties were investigated, which enriches the physics of the Ni-based antiperovskite compounds and help understand the superconductivity in MgCNi3. In this paper, we summarize the research progress in these two aspects. Moreover, a universal phase diagram of these compounds is presented, which suggests a phonon-mediated mechanism for the superconductivity, as well as a clue for searching new superconductors with the antiperovskite structure. Finally, a few possible scopes for future research are proposed.

scholarly journals Distinct superconducting properties and hydrostatic pressure effects in 2D α- and β-Mo2C crystal sheets

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Yunjie Fan ◽  
Chuan Xu ◽  
Xiang Liu ◽  
Chao Ma ◽  
Yuewei Yin ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Hydrostatic Pressure ◽  
Electronic Properties ◽  
Superconducting Transition Temperature ◽  
Important Influence ◽  
Pressure Effects ◽  
Superconducting Transition ◽  
Superconducting Properties ◽  
Disordered Carbon

Abstract Recently, 2D Mo2C, a new member of the MXene family, has attracted much attention due to the exotic superconducting properties discovered in 2D α-Mo2C. Here, not only 2D α-Mo2C but also 2D β-Mo2C crystal sheets with distinct disordered carbon distributions were successfully grown. 2D β-Mo2C shows a much stronger superconductivity than 2D α-Mo2C, and their superconductivities have different hydrostatic pressure responses. The superconducting transition temperature Tc of 2D α-Mo2C shows a dome-shaped profile under pressure, implying the existence of two competing effects arising from phononic and electronic properties, while for 2D β-Mo2C, Tc decreases monotonically with increasing pressure, possibly due to phonon stiffening. These results indicate that the electronic properties have a more important influence on the superconductivity in 2D α-Mo2C compared to 2D β-Mo2C. The ordered and disordered carbon distributions in 2D α-Mo2C and β-Mo2C, respectively, may be the underlying origin for their different electronic and superconducting properties.

Pressure dependence of the superconducting transition temperature in single crystals ofTl2Ba2Ca2Cu3O10−x

1993 ◽  
Vol 47 (9) ◽  
pp. 5524-5527 ◽  
Author(s):  
D. D. Berkley ◽  
E. F. Skelton ◽  
N. E. Moulton ◽  
M. S. Osofsky ◽  
W. T. Lechter ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Single Crystals ◽  
Pressure Dependence ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition
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